The Car and Driver society has procured some long-lens stalker shots of an upcoming Mercedes-McLaren SLR roadster prototype cruising the Canary Islands. The M&Ms have already confirmed the big-buck droptop is on the way. But whether the half-million-dollar supercar will get the coupe's butterfly doors or a straight-up scissor configuration is probably the most pressing question at this juncture. C'mon, the valet community has to know these things for parking's sake.